Hi,
On Thu, May 05 2011, Arindam Nath wrote:
> Marvell controller requires 1.8V bit in UHS control register 2
> be set when doing UHS. eMMC does not require 1.8V for DDR.
> add platform code to handle this.
>
> Signed-off-by: Philip Rakity <[email protected]>
> Reviewed-by: Arindam Nath <[email protected]>
> ---
> drivers/mmc/host/sdhci-pxa.c | 36 ++++++++++++++++++++++++++++++++++++
> 1 files changed, 36 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-pxa.c b/drivers/mmc/host/sdhci-pxa.c
> index 5a61208..b52c3e6 100644
> --- a/drivers/mmc/host/sdhci-pxa.c
> +++ b/drivers/mmc/host/sdhci-pxa.c
> @@ -69,7 +69,40 @@ static void set_clock(struct sdhci_host *host, unsigned
> int clock)
> }
> }
>
> +static int set_uhs_signaling(struct sdhci_host *host, unsigned int uhs)
> +{
> + u16 ctrl_2;
> +
> + /*
> + * Set V18_EN -- UHS modes do not work without this.
> + * does not change signaling voltage
> + */
> + ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
> +
> + /* Select Bus Speed Mode for host */
> + ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
There's something wrong with the tabbing for the comment above.
> + if (uhs == MMC_TIMING_UHS_SDR12)
> + ctrl_2 |= SDHCI_CTRL_UHS_SDR12;
> + else if (uhs == MMC_TIMING_UHS_SDR25)
> + ctrl_2 |= SDHCI_CTRL_UHS_SDR25;
> + else if (uhs == MMC_TIMING_UHS_SDR50) {
> + ctrl_2 |= SDHCI_CTRL_UHS_SDR50;
> + ctrl_2 |= SDHCI_CTRL_VDD_180;
> + } else if (uhs == MMC_TIMING_UHS_SDR104) {
> + ctrl_2 |= SDHCI_CTRL_UHS_SDR104;
> + ctrl_2 |= SDHCI_CTRL_VDD_180;
> + } else if (uhs == MMC_TIMING_UHS_DDR50) {
> + ctrl_2 |= SDHCI_CTRL_UHS_DDR50;
> + ctrl_2 |= SDHCI_CTRL_VDD_180;
> + }
Maybe a switch-case here would be easier on the eyes?
> + sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
> + pr_debug("%s:%s uhs = %d, ctrl_2 = %04X\n",
> + __func__, mmc_hostname(host->mmc), uhs, ctrl_2);
> + return 0;
> +}
> +
> static struct sdhci_ops sdhci_pxa_ops = {
> + .set_uhs_signaling = set_uhs_signaling,
> .set_clock = set_clock,
> };
>
> @@ -141,6 +174,9 @@ static int __devinit sdhci_pxa_probe(struct
> platform_device *pdev)
> if (pdata->quirks)
> host->quirks |= pdata->quirks;
>
> + /* enable 1/8V DDR capable */
> + host->mmc->caps |= MMC_CAP_1_8V_DDR;
> +
> /* If slot design supports 8 bit data, indicate this to MMC. */
> if (pdata->flags & PXA_FLAG_SD_8_BIT_CAPABLE_SLOT)
> host->mmc->caps |= MMC_CAP_8_BIT_DATA;
Thanks,
- Chris.
--
Chris Ball <[email protected]> <http://printf.net/>
One Laptop Per Child
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